If the Democrats were an actual party I could see it.
They aren't. They're a loose collection of cults of personality built around a few key figures, there aren't really "Party" elites because their connection to the Party is merely a rung they climb to their own personal branding. Obama was able to help Biden win the primary because his personal brand is so strong among Democrats, not because he gives a shit about running the Party or advancing the Party's agenda. Even stopping Bernie was more of a way to protect his legacy as the Hope and Change President.